Method of dressing wood-pulp-grinding stones.



K E. P. MILLARD. `METHOD OF DRESSING WOOD PULP GRINDING STONES.

ALlLlOATION FILED OO'1'.17,1ON.

Patented Nov, .24, 1914.

To all 'ao/"mm 'it muy movieman, ,llo 1t Known tl i., Allinwann l-I eritmen oi' the Unito@ Eltatee, ano

'lient oi' Wh zloty of lliiiflfllesei; Stale olh 5 ha e invented, an improve lll i int in. hl lhooo oi? ili'l sing; 'l/Vi'ieilflllzilp Stone@ ol" while-h the itilhiwmy; ileseifiption, .in connection with the awonilniianying drawing-i., is a nintention, like lettere on 'the drawings rept: @eating lille parte.

,lhifi invention is a method el uniformly developing the mit en the lla-lv "hiee at length .tee extenlling.Ak oeifiyihe al. eilt-i oi'nietl on Stones for" grinding wootl into Wilp for nee in the :manhlactoiie ot Dope 1i newepapei, and for 'l ,ernately 'with eheh nhs, lengthwise ending grooyeo that loii'o channels foi* the lahwal of the pulp from the stones; tlm-ing This View illustrates the step in my new method. Fig. 4l; nhoas 'the gl'lnfllng stone after :its suiflaee has been suhjee'eil to the smooth yell shown in iigg. 3, and also shows, exteni .o nevose the periphery ofthe grind ing; etoile, a llntei hushmoll adapted to he rotated with the grinding stone :intl to ell'eet the and @nel step of .my method, which eo'oeiete in the toizhation of the alternating' flat-topped grinding i'ihe ifo the I'ipheiqal surfaces ol? which the @gilt mii ormly tleveloped, and the groove@ that earl-y away the pulp during the @finding opera tion; and Fig. 5 is an end elevation of the form ont the lousshq'oll neel lin aoeorahee with this invention, alter 'the grinding stone a: hoe heen turned clown periphelally to adapt it to lramocon taining' Woofl pockets in a grinflingg machina `(not how/n), the turnedoonfn peripheral surteee is smoothed by the use of a smoothenilfaeeol roll, y extending across the periph eiiy of the grinding stone and rotated in con neetion thei'ewith to literally [brush town all the "wh mollato 'i'ietumll" .or normally in the arca initiate ot t ie 'tened oi' tornati Specification ol' Selettore; votent.

leni Beeeinber ,'29, 1909. thin application tiled October Il, 1914.

llbziflhniieil Nov. let, Mitel.

l'orfeiteil and renewed as Serial No.

Serial. No. 867,099.

tlown :stone af. This lmsli-r01l is oil. steel o1' other haz'gl metal, :mil haa a smooth surface. The glimltone a: :mil the Smooth .roll y,

ehhh olif which has a length greater than tho i thielizhees olih the grinding; stone, .from eide to eide of the latter, are rotated for a euilicient length of time lio develop the grit oif the otono uniformly aroinul its pex'ilihely and from eiile to eine of the sione.

l ain a were that it is old to true grinding stones hy rotating them one against another with theill peiipl'iefies; in contact. But such :in operation neeesearily develops high pointe and indentations on the neifipheral milano ot eac-,h stone, lieeause ew., y stone hals :some hard spots and some soit Spots, anni the hard spots; or points of one stone will always; imlent the sott spots of the stone .in Contact. The purpose of running one grind-stone 'peripherally in Contact with another is not to develop the giit of either Stone uniformly but, on the contrary, to true the grind-:ateneo and to develop relatively high and low pointe in order to cause the grind-stones to out or grind by the action of the high points on tools presented. 'In the present instance, the object of subjecting the tened periphery of the stone to the hard, smooth roll y is to crush down all the high points to the level of the low and relatively .flott points, and to obtain Clear across the petipheial face ot the stone a uniform or unil'oemly level development ol" the grit. In this way l' obtain a grintiinp; Siu-linee of uniform grit before tzahswetsely lluting oi' growing.: the brolioa-tlrmfn surface ot' the stone. ln Fig. Ll. this Hating or transverse riihing ot the stone is ohtaineel by rotating; the grind-stoom tened as; Shown in Fig. 3, in eontaet with a steel bueh-roll z 'provided with alternating lengthwise-exten ling peripheral teeth and grooves. The teeth and grooves are so formed that the ribs '2 of the grindetone are 'left with their tops Het and characterized. by tho'imiforlnly developed grit already described. The grooves 3 between the ribs 2 servoto Caly olf the pulp laterally of the stone llimiting' the grinding operation. The `bush-roll PJ loof a length that exceeds the width oi': the @tone m, so that the alternating ribs andfgyrl'oves are uniformly produced and extend from one side to the othe'u of the Stone. The lohgth of the bush-roll should at least equal the width of the stone. lt if; essentialthat the stone m En i and elle smooth roll y (Fig. 3) lue rotated et elle 5eme surface speed in order uo crush 'in respeet of uniform ture of ell bel newspaper. The pro dueed's of 2L uniform fibrous ohemoer, enel "when, passed' ihrough any proper pepermaking meeliine is converted into paper' of formfiei'eilgtle of soft surface and of e degree of brittlenees, Without moorpomtion of sulte oi' other strengthu giving 'mateiiel Such peper is strong enough to nm. thifough lmglbspeed peper 4 machines, end the peper itself ie strong d r enough @o oe mui through. leigh-goed mg' presses. The ridges. 2, as etat-eil, are leiaesurfeoecl or 'toppeda emi are preferably disposecl three io elle inch, ei'ouncl l@he perpheiy of "ille vgiinizog stone. aware that any pulp grinding stones have ever been .clessed 'Willi vContinuous transve'fse, elifemeiug ribeeied Tooves, no1' om lieu/eue my one, gelei to my uyeiisioun bueh-roll While ai; rest,

e WoodL pulp grinding stone,

em not I 1,1 1eme has ever developed or attempted to develop the peripheral grit of lle stone uniformly by crushu the natural or normal high spots or poulie of the sione to the level of the soft spots'.

Having deseiibeol my invention, Whe: l claim es .new and desire to secure by Leters Patent is; l

The .mei-hooi of firessng the periphery of consisting in first crushing the high spots o1: points of the peripheral surface of e trued stone foo the level of the low points or spots by con tiuuous rotation of the surface of the stone enel e 4lhei'ewitlu' 'oonieotiug smooth roll ei, equal 'surface speeels and thereby developing the grit uniformly across and around. ille periphery of the grinding stoue," and seoonclly, in transversely and uniformly groov ing and ribbing the leveled periphery of the stone fiom edge to edge to form e uniform series ois transverse Het-toppe ribs for grinding the Wood and. enalternatng series of transverse grooves for escape of the ground pulpu :in testimony'. Wheieof, l have signed. .my neme 'izo this speoiioeton, in the presence oi fewo subscribing vtiiiiuessee.l 

